Optical alignment and confinement of an ellipsoidal nanorod in optical tweezers: a theoretical study

Trojek, Jan; Chvátal, Lukáš; Zemánek, Pavel

doi:10.1364/josaa.29.001224

Cited by 53 publications

(43 citation statements)

References 52 publications

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“…The complex amplitude of the induced dipole of the nanodumbbell is p = α x E xxN + α y E yŷN + α z E zẑN , where the complex amplitude of the electric field of the laser beam E is decomposed into components along the principle axes of the nanodumbbell.x N is in the direction along the long axis of the nanodumbbell. The components of the optical force F j and the optical torque M j acting on the nanodumbbell can be expressed as [38]: F j = 1 2 Re{p * · ∂ j E} and M j = 1 2 Re{p * × E} j . The quasi-static polarizability α 0 j (j = x, y, z) of a nanodumbbell can be calculated assuming the electric field is static [39].…”

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confidence: 99%

Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor

et al. 2018

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Levitated optomechanics has great potential in precision measurements, thermodynamics, macroscopic quantum mechanics, and quantum sensing. Here we synthesize and optically levitate silica nanodumbbells in high vacuum. With a linearly polarized laser, we observe the torsional vibration of an optically levitated nanodumbbell. This levitated nanodumbbell torsion balance is a novel analog of the Cavendish torsion balance, and provides rare opportunities to observe the Casimir torque and probe the quantum nature of gravity as proposed recently. With a circularly polarized laser, we drive a 170-nm-diameter nanodumbbell to rotate beyond 1 GHz, which is the fastest nanomechanical rotor realized to date. Smaller silica nanodumbbells can sustain higher rotation frequencies. Such ultrafast rotation may be used to study material properties and probe vacuum friction.

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confidence: 99%

Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor

et al. 2018

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“…These can be specifically investigating the dynamics of trapped particles (Banerjee et al, 2009;Xu et al, 2005;Deng et al, 2007;Ren et al, 2010;Cao et al, 2016;Trojek et al, 2012). Another common goal is the study of the behaviour of non-spherical particles, where the additional degrees of freedom motivate the use of simulations (Simpson and Hanna, 2010a,b;Cao et al, 2012).…”

Section: Applications Of Simulationsmentioning

confidence: 99%

Theory and Practice of Computational Modeling and Simulation of Optical Tweezers

Nieminen

Preez-Wilkinson

Bui

et al. 2015

Optics in the Life Sciences

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Theory and practice of simulation of optical tweezers, Journal of Quantitative Spectroscopy and Radiative Transfer, http://dx.doi.org/10.1016/j.jqsrt.2016.12.026 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractComputational modelling has made many useful contributions to the field of optical tweezers. One aspect in which it can be applied is the simulation of the dynamics of particles in optical tweezers. This can be useful for systems with many degrees of freedom, and for the simulation of experiments. While modelling of the optical force is a prerequisite for simulation of the motion of particles in optical traps, non-optical forces must also be included; the most important are usually Brownian motion and viscous drag. We discuss some applications and examples of such simulations. We review the theory and practical principles of simulation of optical tweezers, including the choice of method of calculation of optical force, numerical solution of the equations of motion of the particle, and finish with a discussion of a range of open problems.

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“…For both structures, the resultant optical torque is enhanced due to the plasmonic polarizability of metallic nanostructures resulting from the collective electrons oscillation. Additionally, optical tweezers has become an important tool for noninvasive manipulation to induce optical force and torque for trapping, moving, aligning and rotating nanostructures in the past decade [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Recently, a spinning spherical Au nanoparticle (NP) irradiated by CP laser beam (830 nm) was found to have a high rotation speed, up to several kHz [12].…”

Section: Introductionmentioning

confidence: 99%

“…Another advantage of light-driven rotation of Au or Ag NP/NW is that the rotation speed can be remotely controlled by adjusting the light power. On the other hand, the trapping and alignment of Au and Ag nanorod (NR) or NW induced by a LP laser beam have been studied [6,[19][20][21][22]. In particular, the parallel and perpendicular alignments of plasmonic NR/NW were pointed out experimentally [6] and theoretically [35].…”

Section: Introductionmentioning

confidence: 99%

Rotating Au nanorod and nanowire driven by circularly polarized light

Liaw¹,

Chen²,

Kuo³

2014

Opt. Express

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The wavelength-dependent optical torques provided by a circularly polarized (CP) plane wave driving Au nanorod (NR) and nanowire (NW) to rotate constantly were studied theoretically. Using the multiple multipole method, the resultant torque in terms of Maxwell's stress tensor was analyzed. Numerical results show that the optical torque spectrum is in accordance with the absorption spectrum of Au NR/NW. Under the same fluence, the maximum optical torque occurs at the longitudinal surface plasmon resonance (LSPR) of Au NR/NW, accompanied by a severe plasmonic heating. The rotation direction of the light-driven NR/NW depends on the handedness of CP light. In contrast, the optical torque exerted on Au NR/NW illuminated by a linearly polarized light is null at LSPR. Due to the plasmonic effect, the optical torque on Au NR/NW by CP light is two orders of magnitude larger than that on a dielectric NR/NW of the same size. The steady-state rotation of NR/NW in water, resulting from the balance of optical torque and viscous torque, was also discussed. Our finding shed some light on manipulating a CP light-driven Au NR/NW as a rotating nanomotor for a variety of applications in optofluidics and biophysics.

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Optical alignment and confinement of an ellipsoidal nanorod in optical tweezers: a theoretical study

Cited by 53 publications

References 52 publications

Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor

Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor

Theory and Practice of Computational Modeling and Simulation of Optical Tweezers

Rotating Au nanorod and nanowire driven by circularly polarized light

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